Compilare: main.cpp: In function 'll Manacher(std::__cxx11::string)': main.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i - k >= 0 && i + k < s.size() && s[i - k] == s[i + k]) ~~~~~~^~~~~~~~~~ main.cpp:38:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:55:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < a.size(); i++) ~~^~~~~~~~~~